<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #gy{ color: green}
    .zf{color: yellow}
    input[type="text"], body>p{ background-color: red}
    body>div>div>p{
      color: pink;
    }
    body div div p{
      background-color: yellow;
    }
    a:link{ color: green}
    a:visited{ color: red}
    a:hover{ color: yellow}
    a:active{ color: pink}
  </style>

</head>
<body>
<ul>
  <li>刘备</li><li id="gy">关羽</li><li class="zf">张飞</li>
</ul>
<p>香蕉</p><p class="zf">苹果</p>
<input type="text">
<input type="password">
<div>
  <p>p1</p>
  <div><p>p2</p></div>
  <div><div><p>p3</p></div></div>
</div>
<a href="http://www.youku.com">优酷</a>
</body>
</html>